Publications

• ART

Effect of fillers size on the dielectric and piezoelectric characteristics of a piezoelectric composite

Sarah Aboubakr, Abdelowahed Hajjaji, Mohamed Rguiti, Khalil Benkhouja, Christian Courtois, Y. Boughaleb

Recent trends in electromechanical conversion using alternative materials, have demonstrated the advantages of using piezoelectric composites for energy generation. There have been several papers on ceramic/polymer composites in which the fillers have high piezoelectric constant. Basically, the…

European Physical Journal: Applied Physics, 2018, 81 (2), pp.20901. ⟨10.1051/epjap/2018170204⟩. ⟨hal-03478740⟩

• THESE

Algebraic-trigonometric Pythagorean hodograph curves for solving planar and spatial interpolation problems and their use for visualizing dental information within 3D tomographic volumes, Les courbes algébriques trigonométriques à hodographe pythagorien pour résoudre des problèmes d'interpolation deux et trois-dimensionnels et leur utilisation pour visualiser les informations dentaires dans des volumes tomographiques 3D

Cindy González

Interpolation problems have been widely studied in Computer Aided Geometric Design (CAGD). They consist in the construction of curves and surfaces that pass exactly through a given data set, such as point clouds, tangents, curvatures, lines/planes, etc. In general, these curves and surfaces are…, Les problèmes d'interpolation ont été largement étudiés dans la Conception Géométrique Assistée par Ordinateur. Ces problèmes consistent en la construction de courbes et de surfaces qui passent exactement par un ensemble de données. Dans ce cadre, l'objectif principal de cette thèse est…

Algebraic Geometry [math.AG]. Université de Valenciennes et du Hainaut-Cambresis, 2018. English. ⟨NNT : 2018VALE0001⟩. ⟨tel-01789081⟩

• COMM

Dental information along curved slices

Cindy González, Ma. I. Pérez, Marianela Lentini, D. Ríos, Gudrun Albrecht, Marco Paluszny

Within the family of ruled surfaces, the developable curved slices have a special property: they may be flattened without deformation. In this paper we introduce a technique to visualize information encoded in a 3D tomographic volume along such a curved slice. This property is deemed useful in…

Computing Conference 2017, Jul 2017, London, United Kingdom. ⟨10.1109/SAI.2017.8252279⟩. ⟨hal-03149552⟩

• COMM

Lagrangian submanifolds in the homogeneous nearly Kahler S3×S3 with constant sectional curvature

Luc Vrancken

In this paper, we investigate Lagrangian submanifolds in the homogeneous nearly Kähler S3 × S3. We introduce and make use of a triplet of angle functions to describe the geometry of a Lagrangian submanifold in S3 × S3. We construct a new example of a flat Lagrangian torus and give a complete…

XIX Geometrical Seminar, Aug 2016, Zlatibor, Serbia. ⟨hal-03155933⟩

• POSTER

«Nanoscale piezoelectric measurements on single PVDF textile filament»

A. Ferri, F. Rault, A. da Costa, C. Cochrane, M. Boudriaux, G. Lemort, C. Campagne, E. Devaux, Christian Courtois, R. Desfeux

Forum des microscopies à sonde locale, 2018, La Rochelle, France. 2018. ⟨hal-01753235⟩

• ART

Design and Construction of a Multifunction Piezoelectric Transformer

Adil Eddiai, Mounir Meddad, Mohamed Rguiti, Aïda Chérif, Christian Courtois

In recent years, piezoelectric materials have particularly found advantageous field of application in electrical energy’s conversion. Especially, the piezoelectric transformers are becoming more and more usable in electrical devices owing to several advantages such as small size, high efficiency,…

Journal of The Australian Ceramic Society, 2018, 55 (1), pp.19-24. ⟨10.1007/s41779-018-0206-3⟩. ⟨hal-03120970⟩

• ART

Sublinearity of the number of semi-infinite branches for geometric random trees

David Coupier

The present paper addresses the following question: for a geometric random tree in R-2, how many semi-infinite branches cross the circle C-r centered at the origin and with a large radius r? We develop a method ensuring that the expectation of the number X-r of these semi-infinite branches is o (r…

Electronic Journal of Probability, 2018, 23, ⟨10.1214/17-EJP115⟩. ⟨hal-03227549⟩

• ART

Crystal structures of Na1.85Mg1.85In1.15(PO4)3 and Ag1 .69In1.31(PO4)3 with alluaudite-type structure

Ahmed Ould Saleck, Abderrazzak Assani, Mohamed Saadi, Cyrille Mercier, Claudine Follet, Lahcen El Ammari

Single crystals of two new phosphates, sodium magnesium indium(III) tris­(orthophosphate) and silver magnesium indium(III) tris­(orthophosphate), were obtained from solid-state reactions. The two phosphates are isotypic and exhibit alluaudite-type structures. They are characterized by a cationic…

Acta crystallographica Section E : Crystallographic communications [2015-..], 2018, E74, pp.1358-1361. ⟨10.1107/S2056989018011799⟩. ⟨hal-04318727⟩

• ART

Conditional Gradient Method for Double-Convex Fractional Programming Matrix Problems

Abderrahman Bouhamidi, Mohammed Bellalij, Rentsen Enkhbat, Khalide Jbilou, Marcos Raydan

We consider the problem of optimizing the ratio of two convex functions over a closed and convex set in the space of matrices. This problem appears in several applications and can be classified as a double-convex fractional programming problem. In general, the objective function is nonconvex but,…

Journal of Optimization Theory and Applications, 2018, 176 (1), pp.163-177. ⟨10.1007/s10957-017-1203-3⟩. ⟨hal-03135657⟩

• COMM

Usage des points massiques et des courbes de Bézier pour la modélisation des cubiques

Karine Serier, Jean-Paul Becar, Lionel Garnier

Cet article étend l'étude des points singuliers et des points d'inflexion des courbes rationnelles cubiques en s'ins-pirant de la méthode proposée par M. Sakai dans le cadre des points massiques. L'intérêt des points massiques permet de représenter une boucle c'est à dire…

GTMG 2018, ENSAM, 2018, AIX EN PROVENCE, France. ⟨hal-02508926⟩